Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/UIElements.MultiColumnTreeView.html below:
Unity - Scripting API: MultiColumnTreeView
AddItem Adds an item to the existing tree. AddToSelectionById Adds an item to the current selection by id. CollapseAll Collapses all TreeView items, including children. CollapseItem Collapses the specified TreeView item. ExpandAll Expands all TreeView items, including children. ExpandItem Expands the specified TreeView item. ExpandRootItems Expands all root TreeView items. GetChildrenIdsForIndex Gets children identifiers for the specified TreeView item. GetIdForIndex Gets the specified TreeView item's identifier. GetItemDataForId Gets data for the specified TreeView item id. GetItemDataForIndex Gets data for the specified TreeView item index. GetParentIdForIndex Gets the specified TreeView item's parent identifier. GetRootIds Gets the root item identifiers. GetSelectedItems Gets tree data for the selected item indices. GetTreeCount Gets the TreeView's total number of items. IsExpanded Returns true if the specified TreeView item is expanded, false otherwise. RemoveFromSelectionById Removes an item from the current selection by id. SetRootItems Sets the root items to use with the default tree view controller. SetSelectionById Sets the currently selected item by id. SetSelectionByIdWithoutNotify Sets a collection of selected items by id, without triggering a selection change callback. TryRemoveItem Removes an item of the tree if it can find it. AddToSelection Adds an item to the collection of selected items. ClearSelection Deselects any selected items. GetRootElementForId Gets the root element of the specified collection view item. GetRootElementForIndex Gets the root element of the specified collection view item. Rebuild Clears the collection view, recreates all visible visual elements, and rebinds all items. RefreshItem Rebinds a single item if it is currently visible in the collection view. RefreshItems Rebinds all items currently visible. RemoveFromSelection Removes an item from the collection of selected items. ScrollTo Scrolls to a specific VisualElement. ScrollToItem Scrolls to a specific item index and makes it visible. ScrollToItemById Scrolls to a specific item id and makes it visible. SetSelection Sets the currently selected item. SetSelectionWithoutNotify Sets a collection of selected items without triggering a selection change callback. HasBubbleUpHandlers Return true if event handlers for the event propagation BubbleUp phase have been attached to this object. HasTrickleDownHandlers Returns true if event handlers, for the event propagation TrickleDown phase, are attached to this object. RegisterCallback Adds an event handler to the instance. RegisterCallbackOnce Adds an event handler to the instance. The event handler is automatically unregistered after it has been invoked exactly once. UnregisterCallback Remove callback from the instance. Blur Tell the element to release the focus. Focus Attempt to give the focus to this element. Add Adds an element to the contentContainer of this element. AddToClassList Adds a class to the class list of the element in order to assign styles from USS. Note the class name is case-sensitive. BringToFront Brings this element to the end of its parent children list. The element will be visually in front of any overlapping sibling elements. Children Returns the elements from its contentContainer. ClassListContains Searches for a class in the class list of this element. Clear Remove all child elements from this element's contentContainer ClearBinding Removes a binding from the element. ClearBindings Removes all bindings from the element. ClearClassList Removes all classes from the class list of this element. AddToClassList Contains Checks if this element is an ancestor of the specified child element. ContainsPoint Checks if the specified point intersects with this VisualElement's layout. ElementAt Retrieves the child element at a specific index. EnableInClassList Enables or disables the class with the given name. FindAncestorUserData Searches up the hierarchy of this VisualElement and retrieves stored userData, if any is found. FindCommonAncestor Finds the lowest common ancestor between two VisualElements inside the VisualTree hierarchy. GetBinding Gets the binding instance for the provided targeted property. GetBindingInfos Gets information on all the bindings of the current element. GetClasses Retrieve the classes for this element. GetDataSourceContext Queries the dataSource and dataSourcePath of a binding object. GetFirstAncestorOfType Walks up the hierarchy, starting from this element's parent, and returns the first VisualElement of this type GetFirstOfType Walks up the hierarchy, starting from this element, and returns the first VisualElement of this type GetHierarchicalDataSourceContext Queries the dataSource and dataSourcePath inherited from the hierarchy. HasBinding Allows to know if a target property has a binding associated to it. IndexOf Retrieves the child index of the specified VisualElement. Insert Insert an element into this element's contentContainer MarkDirtyRepaint Marks that the VisualElement requires a repaint. PlaceBehind Places this element right before the sibling element in their parent children list. If the element and the sibling position overlap, the element will be visually behind of its sibling. PlaceInFront Places this element right after the sibling element in their parent children list. If the element and the sibling position overlap, the element will be visually in front of its sibling. Remove Removes this child from the hierarchy of its contentContainer. RemoveAt Removes a child, at the provided index, from the list of children of the current element. RemoveFromClassList Removes a class from the class list of the element. RemoveFromHierarchy Removes this element from its parent hierarchy. SendEvent Sends an event to the event handler. SendToBack Sends this element to the beginning of its parent children list. The element will be visually behind any overlapping sibling elements. SetBinding Assigns a binding between a target and a source. SetEnabled Changes the VisualElement enabled state. A disabled visual element does not receive most events. Sort Reorders child elements from this VisualElement contentContainer. ToggleInClassList Toggles between adding and removing the given class name from the class list. TryGetBinding Gets the binding instance for the provided targeted property. TryGetDataSourceContext Queries the dataSource and dataSourcePath of a binding object. TryGetLastBindingToSourceResult Returns the last BindingResult of a binding object from the UI to the data source. TryGetLastBindingToUIResult Returns the last BindingResult of a binding object from the data source to the UI.
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